"While much of finding what works for your business on social media
sites is a process of trial and error, recent stats from e-mail
marketing firm ExactTarget (which recently acquired social CRM platform CoTweet) shed some light on how the Facebook population uses the site, and specifically, how it interacts with brands.

First, the good news: Based on its study of 1,500 Facebook users, ExactTarget concluded
that 38% of online U.S. consumers “Like” (formerly “Fan”) a brand on
the social networking site. And the average fan Likes nine different
brands, giving you plenty of opportunity to find your way into potential
customers’ news feeds."